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检索条件"任意字段=2nd International Symposium on Parallel and Distributed Computing, ISPDC 2003"

共 214 条记录，以下是11-20 订阅

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Architecture and implementation of a distributed reconfigurable metacomputer 2

Architecture and implementation of a distributed reconfigura...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Morrison, JP Healy, PD O'Dowd, PJ Natl Univ Ireland Univ Coll Cork Dept Comp Sci Cork Ireland

ISBN: (纸本)0769520693

The use of application-specific co-processors created using reconfigurable hardware (FPGAs) has been shown to realize significant speed increases for many computationally intensive applications. The addition of reconfigurable hardware to clusters composed of commodity machines in order to improve the execution times of parallel applications would, therefore, appear to be a logical step. However, the extra complications introduced by this technique may make the real-world application of such technology appear to be prohibitively difficult. In this paper the design and implementation of a metacomputer designed to simplify the development of applications for clusters containing reconfigurable hardware are presented. The operation of the metacomputer is also discussed in some detail, including the process of implementing applications for execution on the metacomputer.

关键词： Reconfigurable hardware

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On the load distribution and performance of meta-computing systems 2

On the load distribution and performance of meta-computing s...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Savvas, IK Kechadi, T Natl Univ Ireland Univ Coll Dublin Dept Comp Sci Parallel Computat Res Grp Dublin 4 Ireland

ISBN: (纸本)0769520693

In this paper, we study a high-performance Heterogeneous distributed System (HDS) that is employed as a computing platform or grid. Precisely, we study the problem of scheduling a large number of CPU-intensive tasks on such systems. In this study, the time spent by a task in the system is considered as the main issue that needs to be minimized. The proposed techniques of scheduling dynamic tasks consist of two heuristic algorithms;Recursive Neighbor Search (RNS) and Augmented Tabu-Search (ATS) algorithm. Our technique does not address directly the load-balancing problem since it is completely unrealistic in such large environments, but we will show that even a non-perfectly load-balanced system can behave reasonably well by taking into account the tasks' time demands. These algorithms are compared to a well known scheduling algorithm, in order to compare, evaluate, and clarify their performance.

关键词： Scheduling algorithms

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Performance and cost effectiveness of a cluster of workstations and MD-GRAPE 2 for MD simulations 2

Performance and cost effectiveness of a cluster of workstati...

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2nd international symposium on parallel and distributed computing, ispdc 2003

作者： Sumanth, J.V. Swanson, David R. Jiang, Hong University of Nebraska-Lincoln Dept. of Computer Science and Engineering LincolnNE United States

ISBN: (纸本)0769520693

Molecular dynamics (MD) simulations are performed on systems of various sizes up to 32 million atoms. Performance is compared between an MD-GRAPE 2 board, specialized hardware optimized for MD, and a general purpose cluster computer utilizing varied numbers of processors for both short- and long-range potentials. While it is possible to outperform a singleMD-GRAPE 2 board with a sufficient number of processors, tests verses a local cluster and comparison of original purchase price show the MD-GRAPE 2 board is often cost-effective. Potential-specific considerations are discussed.

关键词： Molecular dynamics

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Agent based dynamic recovery protocol in distributed databases 2

Agent based dynamic recovery protocol in distributed databas...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Wang, Y Liu, XS Univ Elect Sci & Technol China Res Lab 8010 Chengdu 610054 Peoples R China

ISBN: (纸本)0769520693

Recovering from node failures is a critical issue in distributed database systems. In conventional log-based recovery protocols, the nodes providing recovery service may be overburdened, especially when the recovery is resource consuming. In this paper, an agent-based dynamic recovery protocol is presented. It divides the whole recovery process into three major steps: log-recovery, agent-recovery, and synchronization. The key idea of this protocol is to cache new database operations initiated during recovery into agents. All these cached operations are then replayed independently for further recovery. The analysis indicates that the new protocol can minimize internode's dependency and improve recovery speed. As a result, system failure rate is cut down and the overall performance gets improved.

关键词： agent dynamic recovery log recovery distributed database systems

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Proposal of an analytical solution for the load imbalance problem in parallel systems 2

Proposal of an analytical solution for the load imbalance pr...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Nour, M Shaheen, S El-Kabbany, GF Hegazy, N Elect Res Inst Cairo Egypt

ISBN: (纸本)0769520693

In this paper, a parallel dynamic load balancing algorithm;which offers a good trade-off between the balancing degree and communication costs;is proposed. The proposed algorithm is analyzed, investigated, and implemented. Also, a new mathematical solution for that algorithm is presented. The analytical solution is tested on standard task graphs (STG) as common test-bed benchmarks. All the different parameters concerned with processors, memory, interconnection networks, and task programs are also presented. The new proposed algorithm is compared and evaluated with a traditional dynamic load balancing one. Experimental results are presented by considering a set of criteria for evaluating the overall performance. Simulation and analytical results proved that the proposed algorithm outperforms the chosen one.

关键词： load distribution rescheduling message passing systems standard task graphs and analytical modeling

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Lightweight logging and recovery for distributed shared memory over virtual interface architecture 2

Lightweight logging and recovery for distributed shared memo...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Park, S Kim, Y Maeng, SR Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Taejon South Korea

ISBN: (纸本)0769520693

As software distributed Shared Memory(DSM) systems become attractive on larger clusters, the focus of attention moves toward improving the reliability of systems. In this paper, we propose a lightweight logging scheme, called remote logging, and a recovery protocol for home-based DSM. Remote logging stores coherence-related data to the volatile memory of a remote node. The logging overhead can be moderated with high-speed system area network and user-level DMA operations supported by modern communication protocols. Remote logging tolerates multiple failures if the backup nodes of failed nodes are alive. It makes the reliability of DSM grow much higher. Experimental results show that our fault-tolerant DSM has low overhead compared to conventional stable logging and it can be effectively recovered from some concurrent failures.

关键词： Digital storage

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Performance analysis of speculative concurrency control algorithms based on wait depth limited for distributed database systems 2

Performance analysis of speculative concurrency control algo...

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Climent, A Bertran, M Babot, F Muixi, JM Ramon Llull Univ Barcelona Spain

ISBN: (纸本)0769520693

distributed Database Management Systems offer advantages and new possibilities to centralized database systems. However, some aspects and issues need to receive further consideration. Concurrency control is one of these aspects that has to be improved in order to increase system performance. Strict Two Phase locking s2pl is the con-currency control mechanism that is used in most commercial database systems. The performance of s2pl can be greatly improved using speculative techniques with speculative Two Phase Locking algorithms sp2pl. In this paper we present extensions of the sp2pl algorithm based on Wait Depth Limited techniques wdl-sp2pl. A comprehensive simulation model is developed from which the performance of sp2pl and the wdl-sp2pl's are evaluated. Our analysis also shows that the new algorithms give a better performance than sp2pl, maintaining the robustness of sp2pl.

关键词： Concurrency control

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The 2nd generation intel core processor. Architectural features supporting HPC

The 2nd generation intel core processor. Architectural featu...

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2011 10th international symposium on parallel and distributed computing, ispdc 2011

作者： Gepner, Pawel Gamayunov, Victor Fraser, David L. Intel Corporation United States

ISBN: (纸本)9780769545400

In this paper we take a look at what the 2nd generation Intel Core processor brings to high performance computing. We compare three generations of Intel CPU based systems and present a performance assessment of these three platforms. We compare three families of Intel CPU based systems utilizing a single socket platform across a number of HPC benchmarks and micro codes focused on different performance criteria, compare the results and discuss the implications for HPC. © 2011 IEEE.

关键词： Benchmarking

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Design of connection management module for MOM 2

Design of connection management module for MOM

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2nd international symposium on parallel and distributed computing (ispdc 2003)

作者： Kang, TG Sohn, KM Jeong, IC Elect & Telecommun Res Inst Distributed Collaborat Comp Res Team Taejon South Korea

ISBN: (纸本)0769520693

MOM technology has become a key component of an enterprise application server which is usually deployed to process business logics. It has to cope with hundreds or even thousands of concurrent connections at the same time. In this end, the efficient and scalable connection management is required for large scale of clients' requests, and various network transport protocols must be taken into consideration when designing the network module of MOM. To facilitate the full support of PTP (Point-to-Point) and publish/subscribe messaging domains, and group communication service featured by MoIM-Message which is our MOM, this paper proposes three types of primitive messaging operations, "synchronous send", "synchronous receive", and "asynchronous receive", and describes the architecture of transport protocol adapter which can be extended to employee various transport protocols. Those functions are implemented into the Message Transport Layer of our MOM which is designed to have three hierarchical layers. Moreover "polling with multiple service thread model" that is applied into the socket adapter, is described to cope with the large number of concurrent clients' connections efficiently. To support mobile client platform, we ported the Client Runtime modules into IPaq PDA by utilizing PersonalJava.

关键词： Java Messaging service MOM Multi-thread PersonalJava Polling RMI Socket

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A distributed Automatic Domain-Specific Multi-Word Term Recognition Architecture using Spark Ecosystem 22

A Distributed Automatic Domain-Specific Multi-Word Term Reco...

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22nd international symposium on parallel and distributed computing, ispdc 2023

作者： Truica, Ciprian-Octavian Istrate, Neculai-Ovidiu Apostol, Elena-Simona University Politehnica of Bucharest Faculty of Automatic Control and Computers Computer Science and Engineering Department Bucharest Romania

ISBN: (纸本)9798350341270

Automatic Term Recognition is used to extract domain-specific terms that belong to a given domain. In order to be accurate, these corpus and language-dependent methods require large volumes of textual data that need to be processed to extract candidate terms that are afterward scored according to a given metric. To improve text preprocessing and candidate terms extraction and scoring, we propose a distributed Spark-based architecture to automatically extract domain-specific terms. The main contributions are as follows: (1) propose a novel distributed automatic domain-specific multi-word term recognition architecture built on top of the Spark ecosystem;(2) perform an in-depth analysis of our architecture in terms of accuracy and scalability;(3) design an easy-to-integrate Python implementation that enables the use of Big Data processing in fields such as Computational Linguistics and Natural Language Processing. We prove empirically the feasibility of our architecture by performing experiments on two real-world datasets. © 2023 IEEE.

关键词： Ecosystems

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